PELV vs SELV vs FELV

Mo¾e li mi netko pojasniti u èemu je razlika izmeðu ovih tipova malog napona? U kojim sluèajevima je dozvoljeno uzemljiti jedan od izvoda sekundara? U èemu je razlika u izolaciji namotaja pripadajuæih transformatora

230/24V kod spomenutih sustava?
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miomao
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